Read this: Picture Quality on BBC HD: a response

Summary: There was an extensive process of assessment in advance of the selection of new encoders for the BBC HD service, using both objective and subjective criteria. The encoders which were chosen then went through further testing in advance of operational use, not only for picture quality but for compatibility with the Sky and Freesat platforms and their ability to deliver other services such as subtitling and surround sound successfully. The new encoders were intended to help us in handling the wide range of material which the BBC broadcasts in HD, and to help to improve the picture quality of some of our most challenging programmes. - bbc.co.uk

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